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United States Patent | 6,244,243 |
Mamiya ,   et al. | June 12, 2001 |
A control device for controlling a direct injection engine provided with an injector for injecting fuel directly into a combustion chamber in a cylinder thereof and a throttle valve is switchable between a stratified charge combustion mode and a uniform charge combustion mode. The control device predicts switching to the uniform charge combustion mode based on a change in the target load Piobj during engine acceleration in the stratified charge combustion mode, and corrects the target load Piobj so that the opening of the throttle valve approaches the opening suited for the uniform charge combustion mode prior to the switching to the uniform charge combustion mode when such combustion mode switching has been predicted. This control device prevents torque shock due to the combustion mode switching during engine acceleration without causing a deterioration in fuel economy or in vehicle acceleration performance.
Inventors: | Mamiya; Kiyotaka (Fuchu-cho, JP); Imada; Michihiro (Fuchu-cho, JP); Tetsuno; Masayuki (Fuchu-cho, JP) |
Assignee: | Mazda Motor Corporation (Hiroshima-ken, JP) |
Appl. No.: | 481112 |
Filed: | January 11, 2000 |
Jan 14, 1999[JP] | 11-007233 |
Current U.S. Class: | 123/295; 123/399; 123/406.51; 123/486 |
Intern'l Class: | F02B 017/00; F02B 023/10; F02D 043/00 |
Field of Search: | 123/295,305,399 |
5628290 | May., 1997 | Iida et al. | 123/305. |
5878711 | Mar., 1999 | Kamura et al. | 123/295. |
5947079 | Sep., 1999 | Sivashankar et al. | 123/295. |
6024069 | Feb., 2000 | Yoshino | 123/295. |
6058906 | May., 2000 | Yoshino | 123/295. |
6167863 | Jan., 2001 | Kazama et al. | 123/295. |
Foreign Patent Documents | |||
4362221 | Dec., 1992 | JP. | |
7301139 | Nov., 1995 | JP. |